Not sure who/where to report this to, but I found that at least this semaphore (and possibly the others by this author, there are a total of three) use a corona that isn't on the DLS. Therefore, when downloaded it has missing dependencies that can't be obtained through the DLS.
It's a shame with there being so few US semaphores, they look pretty nice in the thumbnails.
It's a shame with there being so few US semaphores, they look pretty nice in the thumbnails.